I find myself implementing user management over and over again in almost the same way in each Spring Boot Project:

• user/login
• user/register
• user/reset
• user/activation (email verification)

Is there a user library/plugin for user management in Spring Boot which can handle all the overhead boilerplate in an opinionated way, so that it just takes some configuration (passwordEncoder, smtp credentials, UserDetails, ...)?

I know there are some Oauth clients and identity managements (Okta, Keycloak etc.) which can be connected quite easily, but I'd like something (cheaper and) more lightweight.